If done incorrectly, automatic evisceration can lead to fecal contamination. This can happen during venting, opening of the carcass and during evisceration itself. Use of the correct techniques can significantly reduce or even eliminate this risk.
The blade opening the carcass should cut round the vent and not straight across it. This method avoids damaging the rectum and cutting through the gut and spilling its contents.
Eviscerators should be designed so that the entire viscera pack including the crop is removed undamaged in a single smooth movement.
Once the viscera pack has been automatically drawn, it should be removed from the carcass immediately. For many years now, this has usually involved transferring the pack automatically to a separate pack shackle suspended from its own overhead conveyor system. Packs are transferred with the intestine and vent hanging down and away from the edible giblets, which can then be harvested automatically. Packs should be compact with no trailing intestines long enough to touch and contaminate their neighbor.
In those plants, often handling lower capacities, where packs are not transferred to a separate pack shackle, these should be properly presented over the back of the carcass for easy veterinary inspection and manual giblet harvesting. A straight – as opposed to folded – foot evisceration shackle means that carcasses hang slightly obliquely with minimal contact between the carcass and the potentially contaminating viscera pack.